Whatever you think of de Sade, he was a complex figure and we should not look for easy answers with him. He was, strangely perhaps, against the death penalty, and he was never put in prison for murders or anything like that.

I have paid no poll-tax for six years. I was put into a jail once on this account, for one night; and, as I stood considering the walls of solid stone, I could not help being struck with the foolishness of that institution which treated me as if I were mere flesh and blood and bones, to be locked up...I saw that, if there was a wall of stone between me and my townsmen, there was a still more difficult one to climb or break through, before they could get to be as free as I was.

Whatever is worthy to be loved for anything is worthy of preservation. A wise and dispassionate legislator, if any such should ever arise among men, will not condemn to death him who has done or is likely to do more service than injury to society. Blocks and gibbets are the nearest objects with legislators, and their business is never with hopes or with virtues.